System for autonomous earth-pointing acquisition of a dual-spin

Details System for autonomous earth-pointing acquisition of a dual-spin System for autonomous earth-pointing acquisition of a dual-spin

1981-07-13

1984-03-13

Dobeck, B.

Electricity: motive power systems

Positional servo systems

With particular 'error-detecting' means

318616, 244164, 244171, B64C 1706

Patent

active

044370474

ABSTRACT:
Apparatus for controlling the pointing position of the payload platform of a dual-spin satellite. A torque motor which controls the relative position of the payload platform is controlled by means of a closed-loop feedback system which points the line-of-sight of the platform at a predetermined position on the earth. The control circuitry comprises position and rate sensing devices which monitor the relative position of the line-of-sight and the relative rotational rate of the payload platform. The line-of-sight of the platform is compared to signals indicative of the angular subtense of the earth. If the line-of-sight is pointed at the earth, then position command signals control the torque motor. If, however, the line-of-sight of the platform is not directed at the earth, then rate command signals are summed with the position command signals and subsequently applied to the motor. The combination of the position and rate command signals provides for a system in which the equilibrium state of the system is such that the platform will be despun and earth-pointed. A method of controlling the pointing position of the satellite is also disclosed.

REFERENCES:
patent: 3424402 (1969-01-01), Bulloch et al.
patent: 3984072 (1976-10-01), von Pragenau et al.
patent: 4266173 (1981-05-01), McTigue et al.
patent: 4272045 (1981-06-01), Phillips
patent: 4294420 (1981-10-01), Broquet
patent: 4345728 (1982-08-01), Neufeld

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